manifest: update sdk-zephyr with comparator on nRF54LM20A

Include
Enable comparator on nRF54L20
zephyrproject-rtos/zephyr#88745
nrfconnect/sdk-zephyr#2781

Signed-off-by: Sebastian Głąb <[email protected]>

Author: nordic-segl

west.yml

@@ -65,7 +65,7 @@ manifest:
     # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/modules.html
     - name: zephyr
       repo-path: sdk-zephyr
-      revision: 91f09557641e886420f95a5fb184459b4d2af630
+      revision: pull/2781/head
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above